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How do I set the switches?

Four of the outer electrical feedthroughs (5, 7, 14, 16) are normally connected to the shields of the BNC cables for electrode connects. These (HCS, HVS, LVS+ILVS, LCS+ILCS) can be connected together (all four) by the Shields bridge switch (position DOWN).

The shields bridge provides a current return loop for the current lead shields, as required by some common and advanced impedance spectrometers such as Hewlett Packard 4192A and Solartron 1260 FRA. Others, like NOVOCONTROL Alpha analyzers with 4-wire sample interface have it as an option. Many potentiostats have driven shields in which case the shields must be disconnected from each other. In this case, disengage the switch (position UP).

The connector box has additionally two switches other than the shields bridge. Both connect when down. They have the following functions:

Ch+HCS switch: When DOWN this connects the base unit chassis to the shield (HCS) of the high current (HC) terminal. This actively includes the metal block and the connector box in the shielding and guarding between the leads and towards external interference. (Note that if the HC shield is at ground level from the instrumentation, this connection more or less may already exists in some way via the physical suspension of the cell to a rack, etc.). Refer to your measurement instrumentation and chapters in the ProboStat manual for whether to engage the switch or not. We consider the DOWN position to be default and normal.

LC+HCS switch: When DOWN this connects the current terminal LC to the HCS shield. This is practical when you use the LC terminal as a guard electrode and an impedance device such as the SI 1260 FRA or HP 4192A, which uses the shield system as a guarding ground terminal. As long as you are not using a guard electrode, the default and normal position of this switch is UP.

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